I am curious how folks are handling the section within ASCE 7 stating that flexibility in piping connections to tanks and vessels needs to exist in such a way to allow many inches of displacement (exact amount depends on specific design) in all 6 directions and not allow rupture in the piping. This section is nearly identical to API 650 Annex E. API 650 Annex E is a suggested practice (and we've seen most clients choose to not apply this to piping), whereas ASCE-7 is generally adopted as law in most US states to my knowledge. Are most folks running this displacement rupture analysis on all piping connected to their tanks and vessels?


Per ASCE 7-16 section 15.7.4 "Flexibility of Piping Attachments":


The piping system and tank connection shall also be designed to tolerate Cd times the displacements given in Table 15.7-1 without rupture, although permanent deformations and inelastic behavior in the piping supports and tank shell are permitted.